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Thermal self-focusing during solar flares

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Abstract

By solving a nonlinear equation for a heat source with a power proportional to Т β (β > 1), it is shown that heat localization in the transverse cross section of a magnetic tube with a classical thermal conductivity occurs in the blowup regime in the form of microstructures—temperature background cells bounded by hot walls with a spatial scale of <100 m. The reduction in the integral X-ray emissivity observed on board of spacecrafts in the early stage of the flare is attributed to thermal self-focusing, i.e., a decrease in the factor of filling of the flare volume with hot plasma due to the narrowing of the hot walls of the microstructure.

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Authors and Affiliations

  1. Pushkov Institute of Terrestrial Magnetism, Ionosphere, and Radio Wave Propagation, Russian Academy of Sciences, Troitsk, Moscow, 142190, Russia

    V. A. Kovalev

  2. Faculty of Computational Mathematics and Cybernetics, Moscow State University, Moscow, 119991, Russia

    E. S. Kurkina & E. D. Kuretova

Authors
  1. V. A. Kovalev
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  2. E. S. Kurkina
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  3. E. D. Kuretova
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Correspondence to V. A. Kovalev.

Additional information

Original Russian Text © V.A. Kovalev, E.S. Kurkina, E.D. Kuretova, 2017, published in Fizika Plazmy, 2017, Vol. 43, No. 5, pp. 485–490.

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Kovalev, V.A., Kurkina, E.S. & Kuretova, E.D. Thermal self-focusing during solar flares. Plasma Phys. Rep. 43, 583–587 (2017). https://doi.org/10.1134/S1063780X17050063

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  • DOI: https://doi.org/10.1134/S1063780X17050063

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